AKL has a counter service food court type place and 2 table services, a buffet and a signature dining restaurant. You certainly don't have to dine there to visit and check out the Savannah. You can walk through the amazing lobby and out onto the observation area and see if you can spot some animals grazing. Their gift shop is also one of the best on property as they have a lot of cool African items and animal stuff.
If you think of dining there, Boma is a family friendly buffet with lots of unique items and Jiko is a very good, upscale restaurant with an amazing African wine list and very unique dishes.